import java.util.Scanner;

public class FOR08 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入第一个数");
        int a = sc.nextInt();
        System.out.println("请输入第二个数");
        int b = sc.nextInt();
        int count =0;
        for (int i=a;i<=b;i++){
            if (i%3==0&&i%5==0){
                count++;
            }
        }
        System.out.println(count);
    }
}
